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Modélisation 3D de l'écoulement des calottes glaciaires : application à la calotte du Groenland et aux calottes de l'hémishère nord au dernier maximum glaciaire

Abstract : The earth's climatic system consists in several components which strongly interact (atmosphere, ice sheets, oceans, lithosphere and biosphere). Numerical modelling is one among the appropriate tools for studying these interactions. In this work, the flow of several ice sheets is modelled and particular interest is given to the interface between the ice sheet surface and the atmosphere. This interface is governed by the altitude of the ice sheet surface, the surface temperatures and the accumulation. A 3D ice sheet model is developped and tested on a theoretical ice sheet, within the scope of a European project concerning ice sheet model intercomparison. Then it is applied to the Greenland ice sheet, by simulating the ice sheet response under climates different from today's climate, and by studying its evolution during the last interglacial-glacial cycle. The model sensitivity to the accumulation parameterization is emphasized. The model is at last applied to the reconstruction of the Last Glacial Maximum (about 21 000 years before present) ice sheets in the Northem hemisphere. Three methods are used to compute the climatic conditions in input to the mode!. In the first two methods, these conditions come from a parameterization calibrated of the present values: the results thus obtained are not satisfactory. The third method uses surface temperatures and precipitations coming from the simulations of the Last Glacial Maximum climate, performed with the LMD atrnospheric general circulation mode!. The "coupling" between both models requires a complex data treatrnent, but the ice sheets obtained are in better agreement with geological data on ice sheets extension and thickness at that time.
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Submitted on : Wednesday, December 19, 2012 - 10:50:12 AM
Last modification on : Friday, March 25, 2022 - 11:08:45 AM
Long-term archiving on: : Sunday, December 18, 2016 - 5:43:01 AM

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  • HAL Id : tel-00766870, version 1

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Adeline Fabre. Modélisation 3D de l'écoulement des calottes glaciaires : application à la calotte du Groenland et aux calottes de l'hémishère nord au dernier maximum glaciaire. Glaciologie. Université Joseph-Fourier - Grenoble I, 1997. Français. ⟨NNT : ⟩. ⟨tel-00766870⟩

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